Different python programs, including Glyph’s back-end, require different dependencies. Your computer will quickly become a dystopian nightmare if you install all these different programs’ dependencies system-wide. To isolate environments for your python applications to run, you use virutalenv, a Python library. You’ll install virtualenv on your computer before running Glyph’s ‘start.command’, which when you run it the first time will set up a virtual environment inside the Glyph directory and install all necessary dependencies with pip. 

Make sure you have virtualenv installed or install it if you don’t by opening terminal and typing ’sudo pip install virtualenv’. If you want to learn more about virtual environments or how to set them up, you can read this guide.